These are TakaraTomy toys (and maybe some significant licensed items) currently known from official sources, scheduled for release in MARCHin Japan (as well as in Asia, as most Japanese Transformers toys are also released through Hasbro Hong Kong).

Dates and details can change at any time - Approximate yen prices listed are just a rough guide to their retail price in Japan.
Links were active at the time they were first added and are only there for reference/proof of details - I do NOT endorse or promote any of those businesses.
(posting corrections or additions are greatly appreciated)